My experience on road bikes is limited to newer SRAM Red 10 sp, 15 yr. old 10 sp Dura Ace and brand new 11 sp. 105. This is my experience: The SRAM shifts deliberately with a notable mechanical feel while the Shimano shifts more "smoothly" for lack of a better term. Sort of the difference between cars with manual transmission or paddle shifters. For equal levels of product the SRAM will be lighter. The SRAM needs to be more carefully dialed in. I like both systems and have no problem with either.